I've taken a list of English words, and examined each of them to see what they sound like (using the PHP metaphone function). This page lists the most common metaphone codes, along with their words. You can also search for a word of your own, and see which words sound similar - and which ones rhyme, and which ones alliterate.
barret barrette barred barde buret bared boart beret birretta berretta birred burred baryte barite baryta berried burrito biretta beretta burette brit brat brut bort bred bard bourride bread bride bored borty britt bruit brede board brute beard breed berate birdie borate boride bratty bready bright burdie buried
ferret barret garret terret turret ret burred gnarred tret terete surety pierrot parred buret treat birred warred cruet barred caret hereto fret territ furred greet arete shirred knarred carrot beret tarred worrit garred hereat curred great marred jarred rete whereto parrot chirred purred curet ferrety erred forrit whereat whirred charred churred yirred
barre barrow barrio bar brr brrr burry burrow burro burr birr borrow boar berry bear bare kbar